Carburetor thermostatic needle valve



June 29 1926.

- T. LINGAr cAnBuREToR TEEEMosTATIc NEEDLE vALvE Filed March a. 1920- Patented June 29, 1926.

15mila'JT earner orare si..

TORBJ'RN LING-A,v OF. WAUK-EGANTILLINOIS, .KSSIGNOR TO THE. LIE-NGA. COMPANY-GF- WAUKEGAN, 'ILLINQIS-g A CORBORATIDN' OF ILLINOIS.

CARBURETOR THERMS'DATICS NEEDLE VALVE.

Application; l'ed March'. 8, 1920'.v Serial No; 36451201 t My invention aimsv to improve the performance or manner oft t'uncti'oningci car-Y buretors, suchv as' are' used'tor supplying ex'- plosive" gaseous mixtures. to internal conibustion engines or motors. ills such appliances are now crdinarily' constructed, when not supplied with p rogerr thermostatic means the' needle-valve which controls or' governs the te'ed of fuel tothe-mixing cham'-A ber where the' fuel and; air become inter-- mixed remains set at a suitable' adjustment,

unless manually `temporarily ditplaeed to*- facilitate starting of the motor, with the result that if? the' adjustment the needle is proper ior ordinary running orl service'- conditions it isn'ot that which is lbest' or well in gasolene or other fuel 'for' service condi-f Qt course the motor and' carburetor tions. j j I are usually relatively cold, sometimes tremely so, when the motor is iirst turned? .over and they gradually become much warmerandv insome-cases in tact quite hot under running'conditionsparticularly inthe summer or on long journeys as during tour--y orwitli heavy loadsor steep grades.

rllhel leading'object and prime purpose of this invention isto care orcompensate for all oiV thesey varying circu-mstanceslby auto-y matically regulating `or govern-ing the degree of open-ing' of the needle-valve por-t' by! improvedv means whereby the valve willi` beopenmore when the carburetor and eng-me are; cold and. will be open a less amount when such members are hot-T thusr assuring a` proper or correct richness of mixture or suitablev proportion of its ingredients under all conditions. This is accomplished by making the needle-valve of proper and suitable construction and thermostatic in its action so that its position or opening will vary with the amount of heat or Ideggrec of temperature to which it is subjected.

To this end the steel tapered point portion of the valve is mounted on the end of a rod of hard-rubber or other suitable material with a large co-eiiicient of expansion, such rod being carrie-d, surrounded, and protected by the hollow threaded headed brass stem of the valve which screws into and is adjustable in a threaded opening in the carsion andcontrafction of' the har'dl--rubberthanoff the; metal of the carburetor', thel val-veport with' which the needle-valve coactswilll be opena greater amountV when the carbu-v retor iscoldlthan it will-be when it' is lhet4 and hymn/'king the rubherlrod'o' a proper' length a practically exact compensation lor changes in temperature may' be effected. By surlIOundingorV encasiiigsuch rod inthe meta-lf? threaded stem or the valve, breakage" ot'th'e rod during use, insertion in or removal-trom the carburetorr.V or transportatiom or slripmenti is efectigf'ely prevented the stem constitutes a guard or shield covering the rod wholly'or. in'part.' Itis 'desired to have the rod fit fairly sin-igly'y but" oft course not too tightly, in' theA hollow' stem thus assurii'ng theproper position of thesteeli tapered' point whi'chit'carries in the contraction and expansion movements oi.r the'v 1nd,. which by' means of the. confining1y and guiding acti on' of the stem prevented from. warping or twisting out of itsicorrect' places.

To.. enable' those skilled in. thisy art: taf have; a full!V understanding oct.' the salient charac.-V t'eristi'cs-i of the invention audi its several ad.- vantages I have illustrated in. thee aecompanying drawing forming a part: et' this -specification. a preferred and desirable' embodiment of the invention like' reference characters referring to the same parts; throughoutthe several viewsoifthe drawing..

In. this; drawing:

Figure 1L is a` verticalv section through aY carburetor' equipped` with the improved needle-valve', a' portion of; thee applianceA be-- ing unsectioned g:

Figure 2: is al face view' of the needle-- valveif; and

Figure?) is a longitudinal sectiontlnoughik the needle-valve on an enlarged scale.

Referring to this drawing it will be perceived that the carburetor, except for the new form and style of needle-valve, is of a well known construction, but it is to be understood that other structures .of carburetors may be used to equal advantage.

This carburetor includes the usual fuelchamber 10 equipped with a float 11 controlling the flow of liquid fuel, such as gasolene, thereto in order to maintain a constant and uniform liquid level in such compartment.

The improved thermostatic needle-valve 12 coacts with a nozzle or valve-port 13 through which the gasolene to be atomized is drawn by suction in the usual way. The part 14 is a so-called low-speed tube through which the needle-valve loosely extends permitting passage. or tlow of the gaseous mixture through the annular space between the two elements. The customary throttle 15 is operated by a suitable connection 16 and the choke-valve 17 isactuated by a wire 18 connected to its arm 19, by which two means, respectively, the power delivered by the engine is controlled and the richness of mixture upon starting thel engine may be governed. ln some cases this choke-valve may be eliminated when my improved thermostatie needle-valve is employed, and in .other cases itimay be desirable to retain such choke-valve.

The improved needle-valve 1s threaded thru a split binder-nut 2O screwed into a threaded opening thru the wall of the carburetor, the needle-valve proper comprising a short pointed or conical-shaped steel terminal portion 21 into a` threaded cavity 2'2 ot which is fitted the reduced screw threaded end 22 of a hard-rubber or `other suitable cylindrical thermosta-tic rod 23, Jthe opposite reduced-diameter threaded end 2d ot which is screwed into a socket 25 in the brass or other appropriate metal member :26Vwhich has a knurled head 27 by which .it may be easily manipulated and a long, hollow, externally-threaded stem or shank 28 desirably, but not necessarily, ot' a length to completely cover and shield the whole of the internal, more or less fragile, rubber-rod conveniently of a diameter only slightly less than that of the bore ot the interior ot such stem.

By means of such threaded stem or shank the needle-valve may be readily adjusted to position the pointed member 21 with reference to the valve-port by merely turning the handle 27, the coacting thread of the shank 28 and the internal thread of the nut 2O causing the needle-valve as a whole to advance toward or recedeiirom the port. Obviously since the shank of the needle-valve metal member covers the rubber-rod it fully protects the latter trom damage or injury and because of the relatively close tit between the rod and stem the latter outer element controls the position of the inner member preventing its displacement or distortion and maintaining the conical terminal element in proper and correct position with respect to its companion valve-port. The length of the rubber-rod is so chosen that the difference in expansion and contraction between the rod and the metal portions of the carburetor is such that the valve-port will be open the correct amount to deliver-a proper richness of mixture for the starting ot the motor when the carburetor is cold, and the expansion of the rubber-rod. will be such that the degree of opening of the valve-port will be decreased or diminished as the carburetor heats up, thus maintaining at all times a. proper proportion of the gaseous mixture ingredients depending upon the temperature of the carburetor and engine with which it is associated.

ln many carburetors the advantages of this new invention may be had by merely renier/'ing the old threaded needle-valve and' substituting the new thermostatic one in its place.

rllhe invention is not limited or restricted to the precise and exact details vof structure illustrated and described because these may be moditied to a considerable extent without departure from the substance and essence of the invention and without the sacrifice of any of its substantial benefits and advantages.

l claim:

A thermostatic needle-valve construction of the character described, comprising in combination, a main-body having a head and a lhollow externally screw-threaded shank, a hard-rubber rod accommodated in said shank and having a threaded connection at its inner end with said body, and a pointed valve having a screw-threaded mounting on the outer end of said rod, the bore ot' said shank being substantially the same as the diameter ofsaid rod, said shank being of a length to completely enclose said rod, substantially as described.

'TORBJRN" LrNGA. 

